Composition and process for decontamination of radioactive...

G - Physics – 21 – F

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G21F 9/30 (2006.01) G21F 9/00 (2006.01) G21F 9/28 (2006.01) G21F 9/34 (2006.01)

Patent

CA 2084049

A process for decontaminating radioactive material comprises the step of contacting the material with a dissolving composition to dissolve the contaminants in the material, said composition comprising a dilute solution of about 0.05 molar ethylene diamine tetraacetic acid, about 0.1 molar carbonate, about 10 grams per liter hydrogen peroxide and an effective amount of sodium hydroxide to adjust the pH of the composition to a pH from about 9 to about 11. Also included are the steps of separating the dissolving composition containing the dissolved contaminants from the contacted material and recovering dissolved contaminants from the dissolving composition that has been separated from the material. A composition for dissolving radioactive contaminants in a material, comprising a dilute solution having a basic pH and effective amounts of a chelating agent and a carbonate sufficient to dissolve radioactive contaminants is also provided.

Méthode pour décontaminer des matières radioactives, consistant à mettre en contact la matière avec une composition pour dissoudre les contaminants présents dans la matière, cette composition renfermant une solution diluée, environ 0,05 molaire d'acide éthylènediamine- tétracétique, environ 0,1 molaire de carbonate, avec 10 grammes par litre de peroxyde d'hydrogène et une quantité efficace d'hydroxyde de sodium pour ajuster le pH de la composition à un pH de 9 à 11 environ. L'invention présente également les étapes pour séparer la composition renfermant les contaminants dissous de la matière traitée et pour récupérer les contaminants dissous à partir de la composition qui a été séparée de la matière. Composition pour dissoudre les contaminants radioactifs dans une matière, comprenant une solution diluée à pH basique et des quantités efficaces d'un agent chélateur et de carbonate, suffisantes pour dissoudre les contaminants radioactifs.

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